Consider this Iron Wolf. A Proto Swarm has 6 grenades of 250 HP damage each, 4 swarms in a magazine, which it can probably fire at a rate of one per 2 seconds, i not faster.

That is about 6000 HP damage in one magazine, if the SL user is reasonably competent and manages to get them all on target, fired over perhaps 6-8 seconds.

That is without damage mods.

If you sit on a nanohive, by the time those first 4 swarms are out of the barrel, you'll be reloading to a new full mag. About 5 seconds later at worst, you are ready to let loose another 6000 HP.

So you can see that a squad of these should easily kill even a 16k EHP Sagaris.
The question then becomes, why aren't you?

This is now, later the math will change. For instance, add the webbers that are coming later. Catch a Sagaris in one of those, and it won't even be able to take cover.

Still think Tanks are OP?

And your math uses stats that are known to NOT be applied yet.

Well the other way of doing this evicer is taking the 45% resists to damage and applying it to the forge gun damage so in reality you're only doing about... 682 damage instead.